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Indices Calculation Methodology


Tadawul All Share Index (TASI), Parallel Market Index (NOMU) and the sectors indices are calculated by multiplying the index value of the previous day by the change in the free float market capitalization of all index constituents. 

The below formula explains how TASI, NOMU and sectors indices are calculated: 
Index = (Today’s total free float market capitalization / previous day total free float market capitalization ) x index value of the previous day. 
Where: 
The total free float market capitalization= free float market capitalization of company “A” + free float market capitalization of company ‘B” + …… and so for all companies included in the index.

Free float market capitalization for company “A” = ( Last normal trade price for company “A” X the number of free floated shares of company “A” last normal trade price is the final trade price for any trade which exceeds SAR 15,000 in value. 

An Example of how to calculate the Energy & Utilities sector index:
The companies included in the index: National Gas and Industrialization Co. and Saudi Electricity Co.

Company Free Float Share Last Normal Trade Price Free Floated Market Capitalization
Today Previous Day Today Previous Day
National Gas and Industrialization Co. 50,541,564 27.00 26.20 1,364,622,228.00 1,324,188,976.80
Saudi Electricity Co. 715,804,529 13.20 13.00 9,448,619,782.80 9,305,458,877.00
Total       10,813,242,010.80 10,629,647,853.80

Assuming that the sector index for the previous day closed at 5,000 points
Index Today = (10,813,242,010.80 / 10,629,647,853.80) x 5,000 = 5,086.35 points 

The same methodology mentioned above is used to calculate TASI and for all companies included in index. Unlike individual equities, indices are not subject to a specific fluctuation limit.

Free Float Shares

Free float shares are the only shares available for trading in the Saudi Stock Exchange (Tadawul).  Hence, the shares owned by the following parties are excluded from the Saudi Stock Exchange (Tadawul) index calculations: 

  1. The Government and its institutions;
  2. Foreign partners, if they are not permitted to sell without the prior approval of a supervisory authority;
  3. A founding partner during the restricted period; or
  4. Owners of 10% or more of a company’s shares.

Indices Maintenance

Tadawul maintains indices at the end of each quarter to update the following:

  1. Changes on the numbers of free float shares.
  2. Inclusion of new listed companies to The exchange indices that have completed 20 consecutive days of trading in the exchange.
  3. Exclusion of suspended companies.